Electrical impulse-recorder.



No. 897,670 PATENTED SEPT. 1, 1908.

I A. K. SLOAN, Jn.

ELECTRICAL IMPULSE RECORDER.

APPLICATION FILED APB. 22,1908.

RECORD wwntoz on PATENT OFFICE.

AUGUSTUS K. SLOAN, JR, OF BROOKLYN, NEW YORK.

ELECTRICAL HWPULSE-RECORDER.

To all whom it may concern:

Be it known that I, AUGUSTUS K. SLOAN, Jr., a citizen of the United States, residing at BrookYlyn, in the county of Kings, State of New ork, have invented certain new and useful Improvements in Electrical Impulse- Recorders; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

The resent invention relates to improvements in electro-magnetic instruments designed primarily for use in recording wireless-telephonic and telegraphic messages.

The recording instruments ordinarily included in wireless telephonic and telegraphic apparatus are open to the general defect that no provision is made for varying the speed at which the messages transmitted are received consequently, in manyinstances, the speed of transmission exceeds the ability of t 0 receiving operator, and the messa e for this reason is either lost or imperfect y received and incorrectly recorded.

It is the principal object of this invention, therefore, to provide an extremely sim le and efficient recording instrument in whic such defect is completely avoided, to which end the invention contemplates the rovision of an electro-magnetic instrument y means of which the messa e transmitted may be inscribed u on a onographic or similar rec- 0rd blan an subsequently re roduced therefrom in the ordinary manner, t e speed at which such reproduction is effected being completely under the control of the receiving operator who is thus enabled to vary the speed to suit-the existing circumstances.

Briefl described, the instrument which forms t e subject matter of the invention comprises an electro-magnet throu hwhich the electric current passes, anda st us which carries the armature and is movab e throu h the core of the ma et in the direction of t e record blank, in W 'ch latter depressions of greater or less depth are cut according to the am litude of fluctuation of the current.

the accompanying drawin there is shown a vertical sectional view t ough the instrument embodying invention, it being placed in operative re ation with respect to a record here diagrammatically shown as a aphophone cylinder record.

the figure of the drawin s, the graphephone cylinder or other recor blank is null- Specification of Letters Patent.

Application filed April 22, 1908.

Patented Sept. 1, 1908.

Serial No. 428,673.

cated in general by the reference character A and the instrument embodying my invention in general by the reference character B. As has heretofore been stated, the instrument includes an electro magnet and this magnet is inclosed in a casing, the base of which is indicated by the numeral 5 and the cap or body by the numeral 6, the latter being preferably semi-spherical in form. The electro magnet has its winding indicated by the numeral 7 and its core by the numeral 8. The said electro magnet is supported upon the base 5 of the casin and its core 8 is formed with a longitudina ly and axially extending bore 9, the lower end of which registers with an opening 10 formed through the base 5, the said base being preferably thickened at its center and surroundin said opening. Both the bore 9 and the opening 10 are foursided as shown in the drawings although the may have any other contour correspon ing of course to the cross sectional contour of the stylus which is received therein, I having preferably formed the bore and opening foursided and the stylus rectangular in cross section so as to revent turnin or rotation of the stylus wit 'u the bore an opening.

The stylus mentioned above is indicated by the numeral 11 and is referably formed of brass although, any ot er non-magnetic metal or material may be employed in its manufacture and this stylus, as previously stated, is received in the bore and the 0 ening and has its lower end, turned to a s ight de ree in the direction or rotation of the recor A as indicated at 12 said end being provided with the usual point 18 which may be of silicon carbid or any other material employed for a like purpose. The upper end of the stylus 11 is reduced and threaded as in dicated by the numeral 14, the reduction of the said end resultin in the formation of a shoulder 15 which, w en the oint 13 of the stylus is in position against t e record A, is located in a lane very slightly above the upper end of t e core 8 of the electro magnet. An armature 16, preferably of soft iron is threaded upon the reduced threaded portion 14 of the stylus and is held in adjusted position thereon by means of a set or jam nut 17 also engaged upon the said reduced threaded portion 14.

The operation of the instrument is as follows, it bein of course interposed in the telegraph, telep one or other signal circuit, in connection with which the instrument is used. Fluctuation or current intensity incident to the reception of a messa e will of course result in the armature 16 eing attracted to the core 8 of the electro-magnet so as to bear at its point against the record with a greater or less de ree of firmness according to the amplitude 0 such fluctuation, and depressions of various depths will be in this manner cut in the record, it being of course rotated inthe usual manner.

What is claimed is 1. An electro-magnetic recording instrument comprisin a record blank; a solenoid; a stylus movab e endwise through the core of the solenoid; and an armature carried by the stylus for moving the latter in the direc tion of the record blank under the influence of the solenoid.

2. An electro-magnetic recording instrument, comprising a record blank; a solenoid having its core provided with an axial bore an ular in cross-section; a st lus movable en wise through said bore; and an. armature carried by the st lus, for movin the latter in the direction 0 the record blan under the influence of the solenoid, said stylus being formed angular in cross-section, whereby it is held against rotation during its endwise movement.

3. An electro-magnetic recording instru ment, comprising a record blank; a solenoid; a stylus movable endwise through the core of the solenoid; an armature carried by the stylus, for moving the latter in the direction of the record blank under the influence of the solenoid, said armature being ad'ustable upon the stylus to vary the depth oi the in dentations made upon said record blank; and means for locking the armature in its adjusted position.

In testimony whereof, I aflix my signature, in presence of two witnesses.

A. K. SLOAN, JR.

Witnesses:

S. E. MERRY, THOS. D. MOELHEINE. 

